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Type B Girder Clamp

Standard girder clamp, with flat top, used to quickly connect steel beams with parallel / flat flanges and resist moderate tensile loading.

View technical specification Girder Clamp Configurator


The Type B girder clamp is used to achieve a fast connection between two steel beams and is often used in a pair with Type A clamps. It has a flat top to allow the bolt head or nut to rotate on a hardened washer and can also be used with studs, tie rods or J-bolts. The skirt on the underside of the clamp abuts the edge of the beam flange and prevents the clamp rotating during installation. Type B girder clamps can also be used on their own if one piece of the steel has been pre-drilled.

Features & Benefits

  • Flat top allows the bolt head or nut to rotate on a hardened washer.
  • Ideal for parallel flanges.
  • Suitable up to 17,720lbs tensile load in a four-bolt configuration.


Click on an approval logo to download the certificate or report.

Tail Lengths & Packing Pieces

The clamp is available in three tail lengths, Short, Medium and Long and can be used with Lindapter packing pieces to increase the clamping range. Choose the correct combination of tail length and packing pieces to suit a specific flange thickness. Download datasheet for selection table.

Location & End Plates

Location plates are required when securing two sections together with clamps attached to the upper and lower sections with both clamps directly opposing each other. The plate is positioned between the two sections to hold the bolts at the correct centers and should be fabricated to the dimensions shown in the datasheet.

End Plates should be used when clamps are attached to the supporting section only. The End Plate holds the bolts at the correct centers and should be fabricated to the dimensions shown in the datasheet.


  • Manufactured from malleable iron to BS EN 1562.
  • Available with zinc plated or hot dip galvanized finish.
  • Reaction to fire: A1 (Steel)

Durability and corrosion protection:

Corrosivity Class Galvanized Steel Electroplated Steel
C1 More than 50 years More than 20 years
C2 More than 50 years More than 5 years
C3 More than 20 years Not suitable

For C4 and C5 corrosion categories contact us.

Technical Specification

Click to view labelled diagram

Safe Working Loads (FOS 5:1) Dimensions
Product Code Bolt 8.8 Z Tensile / 1 Bolt Slip / 2 Bolts Tightening Torque* Y X Tail Length V T Width
short medium long
kN kN Nm mm mm mm mm mm mm mm
LB037 M10 1.5 - 20 20 11 4 5 7 10 26
LB050 M12 5.8 0.9 69 26 13 4.5 6 9.5 12 29
LB062 M16 8.5 1.7 147 30 16 5.5 8 11 16 36
LB075 M20 14.7 3.0 285 36 19 7 10 12.5 19 46
LB100 M24 19.7 4.5 491 48 25 9 12 16 25 55

* Torque figures based on bolts / setscrews in an unlubricated condition.

  For Characteristic Resistances when designing a connection to Eurocode 3, please refer to DoP No.003

Safe Working Loads (FOS 5:1) Dimensions
Product Code Bolt Grd. 5 / A325 Z Tensile Resistance / 1 Bolt Slip Resistance / 2 Bolts Tightening Torque* Y X Tail Length V T Width
lbs lbs ft lb short medium long
LB0371) 38" 337 - 15 1316" 716" 532" 316" 932" 38" 1"
LB050 12" 1304 202 50 1" 12" 316" 14" 38" 12" 1 18"
LB062 58" 1911 382 108 1 316" 58" 14" 516" 716" 58" 1 38"
LB075 34" 3305 674 210 1 716" 34" 516" 38" 12" 34" 1 1316"
LB100 1" 4430 1012 362 1 78" 1" 38" 12" 58" 1" 2 18"

1) Requires a hardened washer under the bolt head.

* Torque figures based on fasteners in an unlubricated condition.

Faster to Install

No drilling or welding!

Independently Approved

Reasons to choose Lindapter

  • Save time and money

    Save time and money

    Clamping two steel sections together avoids time-consuming welding or conventional drilling and bolting.

  • Safer connections

    Safer connections

    Drilling and welding in the field is avoided, removing the need for hot work permits and encouraging safer site conditions.

  • High strength

    High strength

    Lindapter clamps are manufactured from high strength materials to resist high load requirements and harsh environments.

  • Industry leading approvals

    Industry leading approvals

    Lindapter has earned a reputation synonymous with safety and reliability, gaining multiple independent approvals.

  • Adjustable


    Quickly align steel sections by sliding the section into the correct position before tightening the Girder Clamp to complete the installation.

  • Free connection detailing

    Free connection detailing

    Lindapter’s experienced Engineers can detail a custom connection based on your specific requirements free of charge.

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